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arXiv · 0807.1982

Parametrizing fluids in canonical quantum gravity

Giovanni Montani·Simone Zonetti
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Abstract

The problem of time is an unsolved issue of canonical General Relativity. A possible solution is the Brown-Kuchar mechanism which couples matter to the gravitational field and recovers a physical, i.e. non vanishing, observable Hamiltonian functional by manipulating the set of constraints. Two cases are analyzed. A generalized scalar fluid model provides an evolutionary picture, but only in a singular case. The Schutz' model provides an interesting singularity free result: the entropy per baryon enters the definition of the physical Hamiltonian. Moreover in the co-moving frame one is able to identify the time variable tau with the logarithm of entropy.

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Giovanni Montani, Simone Zonetti. 2008-07-12. Parametrizing fluids in canonical quantum gravity. https://doi.org/10.1142/s0217751x08040147

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